JPS63104794A - Laser beam machine - Google Patents

Abstract

PURPOSE:To extend the life of bellows by disposing an annular plate to the large-diameter part of the bellows and forming the bore thereof to the size which does not interfere with laser light and is smaller than the small-diameter part of the bellows. CONSTITUTION:Plural pieces of annular plates 9 are disposed at about every other one to the large-diameter part of the bellows 2. The bore size D1 of the plates 9 to be formed is determined larger than the outside edge size D0 of the laser light 8 and smaller than the size D2 in the small-diameter part of the bellows 2. The surface of the plates 9 is formed of Al, etc., and is subjected to a processing to absorb the laser light 8. The laser light 8 falls onto the plates 8 and the bellows 2 is protected even if the laser light 8 is deviated from the optical axis according to the above-mentioned mechanism. The laser light reflected from a work 7 falls similarly to the plates 9 and, therefore, the generation of a damage on the bellows 2 is prevented. The life of the bellows 2 is thereby extended.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a laser processing machine, and particularly to a laser processing machine that is disposed in the optical path of a laser beam and facilitates the operation of a processing head. This figure particularly shows a bellows that allows the processing head of a laser processing machine to expand and contract with respect to a workpiece.

In the figure, a processing head (1) is attached to an optical path duct (3) via a bellows (2) in a telescoping manner. The bellows (2) of the processing head (1) and the optical path duct (3)
) are formed with arm portions (la) and (3a) in the direction perpendicular to the axis, respectively, and a long-sleeved feed screw (4) is formed between the arm portions (la) and (3a). The feed screw (4) is rotated by the drive of the motor (5) coupled to the feed screw (4) at the arm portion (3a) on the optical path duct side, and the machining head (1) is moved into the optical path duct (3).
), the separation distance should be adjusted by yJ. Note that a condensing lens (6) is attached to the processing head (1), and a predetermined process is performed on the workpiece (7) using a condensed laser beam.

However, when the laser processing machine is started, the laser beam (8) reaches the processing head (1) via the optical path duct (3),
A workpiece (7) is processed by a laser beam (8) which is focused by a condensing lens (6) and made high in energy.

[Problem that the invention seeks to solve]

According to the above configuration, when the workpiece (7) is processed by irradiating the laser beam (8), a part of the laser beam (8) is emitted from the workpiece (7).
) The reflected laser beam (8') is reflected from the surface and passes through the condensing lens (6) again, tilting from the optical axis as shown in the figure.
As a result, the bellows (2) is reached.

However, the bellows (2) is generally made of flexible resin, and the energy of the reflected laser beam (8') causes the resin to deteriorate and sometimes even burn. Alternatively, the snake 111 (2) may be
) may interfere with the laser beam (8) and cause similar damage. The latter problem is due to the bellows (
(not shown).

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a laser processing machine in which the laser beams (8) and (8') do not directly interfere with the bellows.

[Means for solving problems]

The present invention has an annular plate sandwiched between the large diameter part of the bellows disposed in the optical path of the laser beam, and the inner diameter of the original plate is set to a size that does not interfere with the laser beam and is smaller than the small diameter part of the bellows. It was formed.

[Effect]

According to the present invention, there is no interference between the bellows and the laser beam, and even if the laser light tries to directly hit the bellows during operation of the processing head, it hits the annular plate before that and prevents direct irradiation of the bellows. The bellows can be effectively protected.

〔Example〕

The present invention will be explained below based on the embodiment shown in FIG.

For convenience of explanation, the same or equivalent parts as in the conventional art are given the same reference numerals, and the features of the present invention will be mainly explained.

As is clear from the figure, the structure is the same as the conventional one except for the bellows (2). Snake 1! ! (2) expands and contracts between the large diameter portion and the small diameter portion as shown in the figure, and in this embodiment, an annular plate (9) is held between every other large diameter portion. The inner diameter of the annular plate (9) is formed to have a dimension D1;
is larger than the outer edge dimension DO of the passage path of the laser beam (8), and smaller than the small diameter portion dimension D2 of the snake fi (2). The annular plate (8) is made of aluminum or the like, and its surface is treated to absorb the laser beam (8), thereby making the above protection more effective.

Therefore, even if the processing head (1) operates and the path of the laser beam (8) deviates from the optical axis, the laser beam first hits the annular plate (9) and the bellows (2), especially It does not hit the small diameter portion and is sufficiently protected from the laser beam (8).

On the other hand, even if reflected laser light (not shown) from the workpiece (7) passes through the condensing lens (6) and enters, the reflected laser light is first irradiated onto the annular plate (9), so the snake IIS !
(2) is effectively protected. Therefore, the bellows (2) can maintain sufficient airtightness.

Incidentally, as a means for holding the annular plate (9) between the bellows (2), the snake FI! There is a method of sandwiching the large diameter part of (2) and gluing it with adhesive, and there is also a method of sewing the edges.

Moreover, FIG. 2 shows a modification of the processing head, and in this embodiment, 1. The arm part (1a) in Example E is separated from the processing head (1), the processing head (1) is made orthogonal to the axis of the optical path duct (3), and the arm part (1a) and the processing head (1) are separated. ), a reflective mirror (10) is arranged at an angle between
@It is bent. Snake In applied to this example
! It goes without saying that the annular plate (2) is also clamped in the same way as in the above embodiment. Even with such a configuration, the same effect as the above embodiment can be achieved.

〔Effect of the invention〕

As described above, according to the present invention, since a predetermined annular plate is sandwiched between the large diameter part of the bellows disposed in the optical path of the laser beam of the laser processing machine, the bellows is effectively protected from laser beam irradiation and has a long service life. It is possible to maintain the airtightness of the bellows.

[Brief explanation of the drawing]

FIG. 1 is an enlarged view of main parts showing one embodiment of a laser processing machine according to the present invention, FIG. 2 is a view equivalent to FIG. 1 showing another embodiment, and FIG. 3 is a view equivalent to FIG. 1 showing a conventional device. It is a diagram. In the figure, (1) is the processing head, (2) is the bellows, (3) is the optical path duct (optical path), (8) is the laser beam, (9) is
is an annular plate. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Masuo Oiwa Figure 1

Claims (3)

[Claims] (1) In a laser processing machine equipped with a bellows arranged along the optical path of the laser beam and formed to be extendable and retractable to allow movement of the processing head, an annular plate is held between the large diameter part of the bellows, and A laser processing machine characterized in that the annular plate has an inner diameter that does not interfere with laser light and is smaller than a small diameter portion of the bellows. (2) The laser processing machine according to claim 1, wherein the annular plate surface is subjected to a surface treatment to absorb laser light. (3) The laser processing machine according to claim 1 or 2, wherein the annular plate is made of aluminum.